Well, I see they launched an ICO and several social media campaigns. It seems like a legit service but I can’t be 100% sure of that. While these kind of portfolio tracking tools can be bad for privacy (they know which coins you have and how many, of course) they can’t steal your coins unless they get access to your private keys. If this app needs your private keys to function, then I’d be very wary of it. It would be best to move your coins to a new wallet if you’ve shared your private keys with it.

Of course, it’s possible to track your own portfolio using a spreadsheet. That’s probably the way I’d choose to do it as it’s free and doesn’t cost you privacy (except perhaps if you use Google Sheets, then Google will know how much coin you have).